MITSUBISHI ELECTRIC WS-48315 User Manual
Page 31
Page 31
Purpose:
Measuring
Instrument
Test Point
Measuring
Range
Input Signal
Ext. Trigger
Input Terminal
Symptom:
Purpose:
Measuring
Instrument
Test Point
Measuring
Range
Input Signal
Ext. Trigger
Input Terminal
Symptom:
MODELS: WS-48315 / WS-55315 / WS-65315
[Video Circuit]
Oscilloscope
JA pin 20
JB pin 5
------
------
Color Bars
Video
To match the sub picture color to that of the main picture.
Main and sub pictures colors differ.
1. Supply an NTSC signal to an External Video Input.
2. Select the NTSC signal as the source for both the main and sub pictures.
3. Connect an oscilloscope to connector JA pin 20
(Main PR).
4. Activate the Adjustment mode.
5. Select Item “41 SCLR” in the Main Matrix Function.
6. Adjust data so the PR signal is 0.71 Vp-p max. - 0.66 Vp-p min
(If it cannot be adjusted within this range, set to the lowest closest value)
When using a Leader 480, set to 0.585±0.02Vp-p.
7. Connect an oscilloscope to connector JB pin 5 (Sub PR).
8. Select item “41 SCLR” in the Sub Matrix Function.
9. Adjust so Sub PR = Main PR (+0.0V -0.05V)
10. Press “ENTER” to save data.
3. Main/Sub Color Level
To set the cutoff point for all three CRTs.
Monochrome has a color tint, or incorrect brightness.
[CRT Circuit]
4. CRT Cutoff
Oscilloscope
TP6R, TP6G, TP6B
------
50V/Div. 2msec/Div.
None
Video Input
Note: Use the Expand mode (full screen)
1. Select an External Input with no signal.
2. Enter the Adjustment Mode, Video Chroma Function.
3. Press “1”, automatically blanks the screen and sets COL to 0.
4. Set the data to the values given in the table below.
5. Connect the oscilloscope to TP6R.
6. Adjust the Red Screen VR so the black level is 170V, as shown below, or
178V ±1VDC using an DC Voltmeter.
7. Repeat Steps 4 and 5 to set the Blue and Green Screen VRs, using
TP6G and TP6B.
Note: White Balance must be performed after this adjustment.
CIRCUIT ADJUST MODE
Activate …….. MENU-0-3-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
CIRCUIT ADJUST MODE
Activate …….. MENU-0-3-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
Item
Abbr Data
1
SCT
42
2
SBRT
20
3
SCON
7
4
RDRH
31
5
GDRH
41
6
BDRH
31
7
CTRH
31
8
CRGH
31
9
CTBH
31
VC Preset Data